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  <title>Validates the document based on its DTD</title>
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    <li>Validates the document based on its DTD</li>
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  <div id="layout-content"><div id="domdocument.validate" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">DOMDocument::validate</h1>
  <p class="verinfo">(PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">DOMDocument::validate</span> &mdash; <span class="dc-title">
   Validates the document based on its DTD
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-domdocument.validate-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>DOMDocument::validate</strong></span>(): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Validates the document based on its DTD. 
  </p>
  <p class="para">
   You can also use the <code class="literal">validateOnParse</code> property of 
   <span class="classname"><a href="class.domdocument.html" class="classname">DOMDocument</a></span> to make a DTD validation.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-domdocument.validate-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-domdocument.validate-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
   If the document has no DTD attached, this method will return <strong><code>false</code></strong>.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-domdocument.validate-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5411">
    <p><strong>示例 #1 Example of DTD validation</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$dom&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$dom</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">load</span><span style="color: #007700">(</span><span style="color: #DD0000">'book.xml'</span><span style="color: #007700">);<br />if&nbsp;(</span><span style="color: #0000BB">$dom</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">validate</span><span style="color: #007700">())&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"This&nbsp;document&nbsp;is&nbsp;valid!\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>
     You can also validate your XML file while loading it:
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$dom&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">DOMDocument</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$dom</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">validateOnParse&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$dom</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">load</span><span style="color: #007700">(</span><span style="color: #DD0000">'book.xml'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-domdocument.validate-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="domdocument.schemavalidate.html" class="methodname" rel="rdfs-seeAlso">DOMDocument::schemaValidate()</a> - Validates a document based on a schema. Only XML Schema 1.0 is supported.</span></li>
    <li class="member"><span class="methodname"><a href="domdocument.schemavalidatesource.html" class="methodname" rel="rdfs-seeAlso">DOMDocument::schemaValidateSource()</a> - Validates a document based on a schema</span></li>
    <li class="member"><span class="methodname"><a href="domdocument.relaxngvalidate.html" class="methodname" rel="rdfs-seeAlso">DOMDocument::relaxNGValidate()</a> - Performs relaxNG validation on the document</span></li>
    <li class="member"><span class="methodname"><a href="domdocument.relaxngvalidatesource.html" class="methodname" rel="rdfs-seeAlso">DOMDocument::relaxNGValidateSource()</a> - Performs relaxNG validation on the document</span></li>
   </ul>
  </p>
 </div>

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